EP0776176B1 - Medizinisches diagnose-, behandlungs- und darstellungssystem - Google Patents

Medizinisches diagnose-, behandlungs- und darstellungssystem Download PDF

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Publication number
EP0776176B1
EP0776176B1 EP95908708A EP95908708A EP0776176B1 EP 0776176 B1 EP0776176 B1 EP 0776176B1 EP 95908708 A EP95908708 A EP 95908708A EP 95908708 A EP95908708 A EP 95908708A EP 0776176 B1 EP0776176 B1 EP 0776176B1
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EP
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Prior art keywords
locating system
sensor
signals
catheter
orientation
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EP95908708A
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English (en)
French (fr)
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EP0776176A1 (de
Inventor
Shlomo Ben-Haim
Daniel Osadchy
Udi Peless
Ilan Greenberg
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Biosense Webster Inc
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Biosense Inc
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6846—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be brought in contact with an internal body part, i.e. invasive
    • A61B5/6847—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be brought in contact with an internal body part, i.e. invasive mounted on an invasive device
    • A61B5/6852—Catheters
    • A61B5/6859—Catheters with multiple distal splines
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
    • A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
    • A61B18/14—Probes or electrodes therefor
    • A61B18/1492—Probes or electrodes therefor having a flexible, catheter-like structure, e.g. for heart ablation
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B34/00—Computer-aided surgery; Manipulators or robots specially adapted for use in surgery
    • A61B34/20—Surgical navigation systems; Devices for tracking or guiding surgical instruments, e.g. for frameless stereotaxis
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/06—Devices, other than using radiation, for detecting or locating foreign bodies ; determining position of probes within or on the body of the patient
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/06—Devices, other than using radiation, for detecting or locating foreign bodies ; determining position of probes within or on the body of the patient
    • A61B5/061—Determining position of a probe within the body employing means separate from the probe, e.g. sensing internal probe position employing impedance electrodes on the surface of the body
    • A61B5/062—Determining position of a probe within the body employing means separate from the probe, e.g. sensing internal probe position employing impedance electrodes on the surface of the body using magnetic field
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
    • A61B5/6843—Monitoring or controlling sensor contact pressure
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
    • A61B8/08—Detecting organic movements or changes, e.g. tumours, cysts, swellings
    • A61B8/0833—Detecting organic movements or changes, e.g. tumours, cysts, swellings involving detecting or locating foreign bodies or organic structures
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00—Catheters; Hollow probes
    • A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
    • A61M25/0105—Steering means as part of the catheter or advancing means; Markers for positioning
    • A61M25/0133—Tip steering devices
    • A61M25/0147—Tip steering devices with movable mechanical means, e.g. pull wires
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00636—Sensing and controlling the application of energy
    • A61B2018/00773—Sensed parameters
    • A61B2018/00869—Phase
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B34/00—Computer-aided surgery; Manipulators or robots specially adapted for use in surgery
    • A61B34/20—Surgical navigation systems; Devices for tracking or guiding surgical instruments, e.g. for frameless stereotaxis
    • A61B2034/2046—Tracking techniques
    • A61B2034/2051—Electromagnetic tracking systems
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
    • A61B90/36—Image-producing devices or illumination devices not otherwise provided for
    • A61B2090/364—Correlation of different images or relation of image positions in respect to the body
    • A61B2090/367—Correlation of different images or relation of image positions in respect to the body creating a 3D dataset from 2D images using position information
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
    • A61B90/36—Image-producing devices or illumination devices not otherwise provided for
    • A61B90/37—Surgical systems with images on a monitor during operation
    • A61B2090/378—Surgical systems with images on a monitor during operation using ultrasound
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
    • A61B90/39—Markers, e.g. radio-opaque or breast lesions markers
    • A61B2090/3954—Markers, e.g. radio-opaque or breast lesions markers magnetic, e.g. NMR or MRI
    • A61B2090/3958—Markers, e.g. radio-opaque or breast lesions markers magnetic, e.g. NMR or MRI emitting a signal
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B2562/00—Details of sensors; Constructional details of sensor housings or probes; Accessories for sensors
    • A61B2562/16—Details of sensor housings or probes; Details of structural supports for sensors
    • A61B2562/17—Comprising radiolucent components
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00—Electrotherapy; Circuits therefor
    • A61N1/18—Applying electric currents by contact electrodes
    • A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
    • A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
    • A61N1/362—Heart stimulators
    • A61N1/3627—Heart stimulators for treating a mechanical deficiency of the heart, e.g. congestive heart failure or cardiomyopathy

Definitions

  • the present invention relates to medical diagnosis, treatment and imaging systems. More particularly, the present invention relates to medical probes whose location can be detected and adjusted and which have an additional detection, imaging and/or treatment function, according to the preamble of claim 1.
  • Probes such as catheters, suitable for various medical procedures and internal imaging, are fairly common. Such probes include: balloon angioplasty catheters, catheters with laser-, electrical- or cryo-ablation characteristics, catheters having ultrasound imaging heads, probes used for nearly incisionless-surgery or diagnosis, and endoscopes. Where such probes are used for treatment, the probes must be carefully positioned in relation to the body structure. Even for imaging systems such as ultrasound systems, some positioning capability has been described.
  • U.S. Patent No. 5,042,486 to Pfeiller et al. describes a method in which the position of a catheter tip is located using electromagnetic fields. The catheter is introduced and the tip location is followed. The path of the tip is superimposed on the pre-registered image of the blood vessel or the organ, through which the catheter was advanced.
  • this technology requires acquisition and processing of images prior to the procedure and involves a highly sophisticated and time-consuming procedure for the correct alignment of the image acquired previous to this procedure, and the orientation and location of the blood vessel or the organ during the catheterization procedure itself.
  • U.S. Patent 4,821,731 to Martinelli et al. discloses a method for internal imaging of a living body using ultrasound.
  • the position of an ultrasound imaging catheter is determined by computing the relative position of the catheter using the response of an ultrasound transducer to a reference signal and by computing the angular orientation of the catheter about its axis by determining the signal induced in a single coil by substantially perpendicular magnetic fields of different frequencies.
  • the ultrasound transducer is also used to send and detect ultrasound signals in a direction perpendicular to the catheter axis. By rotating the catheter and moving it along its axis an ultrasound image may be generated.
  • the catheter is also described as being capable of transmitting a laser beam to the end thereof to ablate tissue from lesions on the walls of arteries.
  • a catheter which can be located in a patient using an ultrasound transmitter located in the catheter is disclosed in U.S. Patent No. 4,697,595 and in the technical note "Ultrasonically Marked Catheter, a Method for Positive Echographic Catheter Position and Identification", Bryer et al., Medical and Biological Engineering and Computing, May, 1985, pages 268-271. Also, U.S. Patent No. 5,042,486 discloses a catheter which can be located in patients using non-ionizing fields and suitably imposing catheter location on a previously obtained radiological image of the blood vessel.
  • PCT Patent Publication WO 94/0938 describes a system using a single-coil type sensor which is coaxial with the long axis of a catheter and which senses fields which are generated by three multicoil generators external to the body of a patient.
  • U.S. Patent No. 3,644,825 describes a system which uses the relative motion of a sensor in the determination of its position.
  • the relative motion supplies information to the sensing coils needed to identify position and orientation.
  • such a solution is not applicable to identifying position and location of the object where there is no relative motion between the object and the reference frame.
  • U.S. Patent No. 3,868,565 comprises a tracking system for continuously determining the relative position and orientation of a remote object.
  • This tracking system includes orthogonally positioned loops for both a plurality of sensors and a plurality of radiating antennas. With the proper excitation currents to those loops, the radiating antennas generate an electromagnetic field that is radiated from those antennas to the sensor.
  • the tracking system operates as a closed loop system where a controlling means measures the field that is received at the sensor at the remote object and feeds the information back to radiating antennas to provide a nutating field radiating as a pointing vector towards the remote object. Accordingly, the pointing vector gives the direction to the sensing antenna from the radiating antenna.
  • Kuipers describes in his U.S. Patent No. 4,017,858, an electromagnetic field which rotates about a pointing vector and is used both to track or locate the remote object in addition to determining the relative orientation of the object.
  • This system wherein the radiating coils are charged with the properly designed wave forms, generates a magnetic field which, in a closed loop manner, can be fed into processing means to generate the information needed to determine an orientation of a remote object.
  • U.S. Patent No. 4,054,881 describes a non-tracking system for determining the position and location of a remote object with respect to a reference frame. This is accomplished by applying electrical signals to each of three mutually-orthogonal, radiating antennas, the electrical signals being multiplexed with respect to each other and containing information characterizing the polarity and magnetic moment of the radiated electromagnetic fields. The radiated fields are detected and measured by the three mutually orthogonal receiving antennas having a known relationship to the remote object, which produce nine parameters. These nine parameters, in combination with one known position or orientation parameter, are sufficient to determine the position and orientation parameters of the receiving antennas with respect to the position and orientation of the radiating antennas.
  • U.S. Patent No. 4,849,692 describes a quantitative method for measuring the relative position and orientation of two bodies in the presence of metals. Measuring the position and orientation of receiving antennas with respect to the transmitting antennas is achieved using direct current electromagnetic field signals. Electromagnetic radiation is designed to be transmitted in a sequence by each of the mutually orthogonal radiating antennas. A receiving antenna measures the values of transmitted direct current magnetic fields, one dimension at a time, and those of the earth's magnetic field as well. This method requires repetitive acquisition and computations to determine position and location of remote objects.
  • a system which incorporates a catheter which includes a position measuring device which can determine the position of the catheter in three dimensions, but not its orientation.
  • this catheter is used to map the electrical activity at the inner walls of the heart and to ablate portions of the heart muscle in response to such mappings.
  • the position of the catheter used for the mapping/ablation function is determined with reference to three position detecting devices which are positioned against the inner wall of the heart at three different stable locations to form a reference plane.
  • WO-A-90/13259 shows an ultrasound transducer fixed in its axial rotation capability. To generate three-dimensional ultrasound representations knowledge of the transducer position around the axis is not essential. The position is calculated using two sensors and two field induction loops.
  • WO-A-92/03090 uses an axial symmetrical catheter wherein the degree of freedom of rotation around its axis is not relevant.
  • the coils shown are all axially directed and cannot be used to determine the orientation angle about the axis of the catheter.
  • the present invention is defined in independent claims 1 and 30. It concerns a catheter locating means and method that offers quantitative, high resolution locating information that, when assimilated with sensed local information results in a high resolution detailed map of the information. This map may optionally be superimposed on an image or other representation of the organ architecture.
  • the locating means preferably generates continuous location and orientation information concerning a remote object, in particular a catheter, relative to a reference frame, in a non-iterative manner.
  • One aspect of the present invention relates to the provision of a new six-dimensional positioning apparatus suitable for use with a catheter.
  • a plurality of non-concentric coils are placed in a catheter adjacent a locatable site, for example, its distal end.
  • the coils preferably have orthogonal axis.
  • the relative positioning of the coils differs from that described in the prior art in that the coils are separated in space and are not concentric. These coils generate signals in response to externally applied magnetic fields which allows for the computation of six position and orientation dimensions.
  • a second aspect of the present invention is directed toward a new method for computing multi-dimensional position and orientation of a coil system from signals produced by the coils in response to a system of externally applied electromagnetic fields.
  • a third aspect of the present invention allows for the mapping of the interior of the heart in a manner similar to that described in the above-referenced patent applications assigned to the assignee of the present application, with the simplification that only a single six-dimensional location/orientation detection sensor is used for reference.
  • a fourth aspect of the present invention involves an ultrasonic or other imaging probe having a six-dimensional positioning capability in response to external electromagnetic fields. Use of such a probe obviates the use of ionizing radiation or sonic sensing for position determination and gives ultrasonic or other imaging information whose direction and orientation is completely known.
  • a fifth aspect of the invention involves methods and apparatus for adding a controlled change in orientation to a catheter, thereby to allow for maneuvering of the cathode and its easy placement.
  • a sixth aspect of the invention utilizes the controlled change in orientation to allow for two or three-dimensional imaging using a non-scanning probe, such as an ultrasound probe or for three-dimensional scanning using a two-dimensional scanning probe.
  • a non-scanning probe such as an ultrasound probe or for three-dimensional scanning using a two-dimensional scanning probe.
  • one or both of the plurality of field generators or sensors comprises three distinguishable, non-overlapping, generators or sensors.
  • each sensor comprises a coil.
  • said plurality of coils have axes which intersect within a coil.
  • said plurality of coils comprises three coils, said coils preferably have axes which do not all intersect in a point.
  • the signal processor cross-correlates the signals corresponding to the drive and sensor signals.
  • the fields generated by each of the generators have a different frequency, a different phase, or both a different frequency and a different phase.
  • each field generator has a different frequency, preferably frequencies which are each integer multiples of a given frequency.
  • the duration of the cross-correlation of the inputs is the minimal common product of the integer multipliers divided by the given frequency.
  • the results of the cross-correlation are used to calculate the contribution of each field generator to the signal generated by each said sensor.
  • the locating system includes a display system for displaying the position of the point on the invasive medical instrument.
  • the locating system further comprises a reference instrument which includes a plurality of additional non-overlapping sensors situated in a reference instrument which sensors generate sensor sighals in response to said fields, wherein said display system displays the position of the portion on the invasive medical instrument relative to the position of a point on the reference instrument.
  • the reference instrument is an invasive medical instrument.
  • the sensors are situated proximate the distal end of the reference invasive medical instrument.
  • the locating system includes an additional sensor on a portion of the invasive medical instrument which senses a local condition.
  • the additional sensor senses local electrical signals, for example electrical signals from the endocardium of the patient's heart, and transfers them to terminals external to the patient's body.
  • the signal processor processes the position and orientation coordinate signals and the local electrical signals acquired at a plurality of points on the endocardium to generate a map that represents the propagation of electrical signals through tissue in the patient's body.
  • the additional sensor supplies electrical energy to the endocardium for ablating a portion of the endocardium.
  • the locating system includes an electrode adapted for supplying electrical energy to the endocardium for ablating a portion of the endocardium.
  • the additional sensor is an ultrasonic transmitter/receiver.
  • the ultrasonic transmitter/receiver provides a less than three dimensional representation of the acoustic properties of tissue beyond the distal end.
  • the distal end is deflectable.
  • the system includes image reconstruction circuitry which receives a plurality of said less than three dimensional representations acquired at different orientations of the distal end and produces a three dimensional map of the acoustic properties of tissue at least partially surrounding the distal end.
  • the invasive medical instrument may be, for example, a catheter or endoscope, comprising a plurality of magnetic field sensors, preferably coils, proximate the distal end thereof.
  • the plurality of coils have axes which intersect within a coil. Where the plurality is three, the said coils have axes which do not all intersect in a point.
  • the instrument comprises an ultrasound transducer at said distal end.
  • the ultrasound transducer provides a representation, preferably a one or two dimensional representation, of the acoustic properties of tissue beyond and along the axis of the catheter.
  • the instrument further comprises an electrical probe at said distal end.
  • the probe is preferably adapted to sense electrical signals generated by tissue which is in contact and conduct said signals to the proximal end of the catheter and/or to supply an ablative electrical signal to tissue contacting said terminal.
  • the instrument includes a sensor for measuring local chemistry at the distal end.
  • the instrument includes means for changing the orientation of the distal end.
  • FIG. 1 shows a pictorial representation of a basic preferred application of the invention to the human body.
  • a catheter 10 is inserted into an artery 11 of a patient using standard techniques.
  • Catheter 10 comprises a body 12, a locating sensor 14 and an active portion 16 at the distal end 15 of the catheter.
  • the active portion 16 in accordance with various preferred embodiments of the invention, may include an electrical sensor, an ultrasound head, a fiber optic viewing head, an electrical stimulator, an electrical or laser ablator, an ionic sensor, an oxygen or carbon dioxide sensor, an accelerometer, a blood pressure or temperature sensor or a cryogenic probe.
  • the catheter will include leads, light guides, wave guides, etc. for energizing the active portion in response to commands of an operator.
  • the locating sensor 14 comprises two or three antennas, for example coils which are irradiated by two or three radiators 18, 20 and 22, which are outside the body surface 23 of the patient.
  • the radiators useful in a medical application comprise wound annular coils from about 2 to 20 cm in diameter (O.D.) and from about 0.5 to 2 cm thick, in a coplanar, triangular arrangement where the centers of the coils are from about 2 to 30 cm apart. Bar-shaped radiators or even triangular or square-shaped coils could also be useful for such medical applications.
  • the radiators are preferably positioned in or below the surface upon which the patient is resting, substantially directly below the portion of the patient's body where a procedure is being performed. In other applications, the radiators may be fairly close to the skin of the patient.
  • the three radiators are driven by a radiator driver 24, preferably in a manner described below, and the signals received by the receiving antennas are amplified and processed, together with a representation of the signals used to drive radiators 18, 20 and 22, preferably in the manner described below, in a signal processor 26 to provide a display or other indication of the position and orientation of the distal end 15 on a monitor 27.
  • Radiators 18, 20 and 22 may be arranged in any convenient position and orientation, so long as they are fixed in respect to some reference frame, and so long as the radiators are non-overlapping, that is, there are no two radiators with the exact, identical location and orientation.
  • radiator driver 24 When driven by radiator driver 24, the radiators generate a multiplicity of distinguishable AC magnetic fields that form the magnetic field sensed by receiving antennas in the locating sensor.
  • the magnetic fields are distinguishable with regard to the frequency, phase, or both frequency and phase of the signals in the respective magnetic fields. Time multiplexing is also possible.
  • the active end of the catheter may be used to gather information, such as ultrasound echo information, electrical activity information etc., and optionally to perform certain procedures on the arteries (or veins) or within an organ chamber 28 to which the artery (or vein) leads.
  • organ chambers are the chambers of the heart, brain or gastrointestinal tract. It is a particular object of some aspects of the present invention to more accurately map the electrical activity of the heart and to more accurately image the walls of the heart, as will be described in more detail below.
  • Fig. 2 shows a schematic illustration of a preferred embodiment of the distal end of catheter 10.
  • a graphic illustration of locating sensor 14 is shown in Fig. 3.
  • Sensor 14 preferably includes two or more and more preferably three sensor coils 30, 32 and 34 wound on air cores.
  • the coils have mutually orthogonal axes, one of which is conveniently aligned with the long axis of the catheter.
  • the coils of the preferred embodiment of the invention are closely spaced along the axis of the catheter to reduce the diameter of the locating sensor and thus make the sensor suitable for incorporation into a catheter.
  • the present invention quantitative measurement of the position and orientation of the catheter distal end relative to a reference frame is necessary.
  • This requires at least two non-overlapping radiators that generate at least two distinguishable AC magnetic fields, the radiators' respective positions and orientations relative to the reference frame being known; a radiator driver which preferably continuously supplies the radiators with AC signals to generate the AC magnetic fields; and a location sensor, consisting of at least two non-parallel sensors to measure the magnetic field flux resulting from the at least two distinguishable magnetic fields.
  • the number of radiators times the number of sensors is equal to or greater than the number of degrees of freedom of the desired quantitative measurement of the position and orientation of the sensors relative to the reference frame.
  • the six position and orientation coordinates of the distal tip of the catheter are determined, at least two coils are required in location sensor 14. Preferably three coils are used to improve the accuracy and reliability of the position measurement.
  • Leads 36 are used to carry signals detected by the sensor coils to signal processor, via the proximal end of the catheter, for processing to generate the required position information.
  • leads 36 are twisted pairs to reduce pick-up and may be further electrically shielded.
  • coils 30, 32 and 34 have an inner diameter of 0.5 mm and have 800 turns of 16 micrometer diameter to give an overall coil diameter of 1-1.2 mm.
  • the effective capture area of the coil is preferably about 400 mm 2 . It will be understood that these dimensions may vary over a considerable range and are only representative of a preferred range of dimensions. In particular, the size of the coils could be as small as 0.3 mm (with some loss of sensitivity) and as large as 2 or more mm.
  • the wire size can range from 10-31 micrometers and the number of turns between 300 and 2600, depending on the maximum allowable size and the wire diameter.
  • the effective capture area should be made as large as feasible, consistent with the overall size requirements. While the preferred sensor coil shape is cylindrical, other shapes can also be used. For example a barrel shaped coil can have more turns than a cylindrical shaped coil for the same diameter of catheter. Also, square or other shaped coils may be useful depending on the geometry of the catheter.
  • Leads 38 are used to power active portion 16 and/or to receive signals therefrom.
  • the nature of leads 38 which may vary and may, for example, include an optical waveguide or other transmission media as appropriate to their task.
  • an electrode located on the distal tip of the catheter records local cardiac electrical activity, for example, on the endocardium.
  • ECG's local electrograms
  • the amplified ECG signals are transferred to the control system that presents to the physician the local electrogram morphology acquired from the site whose location was determined at the same time.
  • Figure 4 is a block diagram of preferred circuitry used in computing the position of locating sensor 14.
  • three radiators 18, 20 and 22 and three sensor coils 30, 32 and 34 are used.
  • Radiator driver 24 provides distinguishable, simultaneous AC current signals to each radiator.
  • Control circuitry 40 utilizes D/A convertors 42, 44 and 46 to generate three sine waves of three different frequencies, f 1 , f 2 and f 3 , which are output separately to signal amplifiers 48, 50 and 52.
  • the ratio between frequencies should be a rational number.
  • the radiating driver amplifier output signals are delivered to the radiators through current sensitive circuitry 54, 56 and 58, such as a resistor, loop or more sophisticated circuitry as is known in the art.
  • the current-sensitive circuitry produces an output which represents the amplitude and phase of the driving signal for the radiators and which is passed to signal processor 26.
  • the three radiators will generate a magnetic field composed of three differently oriented field components each having a different known frequency.
  • Each of these field components will be sensed by each of sensor coils 30, 32 and 34 which will each produce a signal composed of three frequency components having different amplitudes and phases depending on the relative distance and orientation of the particular sensor coil and particular radiator which radiates a particular frequency.
  • the outputs signals of sensors 30, 32 and 34 are amplified in amplifiers 60, 62 and 64 respectively and passed on to signal processor 26.
  • Fig. 5 shows in expanded detail the basic flow chart representing a control sequence and its application to the circuitry of Fig. 4.
  • the frequencies of the three sine waves, the physical position and orientation of radiators 18, 20 and 22 in respect to a reference frame, the properties of the radiators and sensors and the coordinates of a single point in the mapping field are defined.
  • Sine waves having respective frequencies f 1 , f 2 and f 3 are synthesized as indicated by block 68, for example in control 40.
  • These generated frequencies are transmitted, preferably continuously, by radiators 18, 20 and 22 as indicated by block 70 and as described above with reference to Fig. 4.
  • the control sequence enters a timing loop 72 that periodically sends signals to activate the signal processor to cross-correlate the coil sensor signals with the radiated signals and to calculate the orientation and position of locating sensor 14 relative to the reference frame.
  • Fig. 6 is a functional block diagram of signal processor 26.
  • the inputs to the processing block are the signals from amplifiers 60, 62 and 64 (the sensor coil signals) denoted by SIG and inputs from current sensing circuits 52, 56 and 58 denoted as CUR.
  • the six input signals are converted from analog to digital signals by an array of A/D converters 74.
  • the sampled digital signals are passed to the "calculate cross correlation" block 76, which may consist of dedicated circuitry or which may be performed by a dedicated or shared microprocessor.
  • the cross correlation elements can be calculated using the following method:
  • a preferred ratio of f 1 , f 2 and F 3 is 1, 2, 3 and preferred frequencies are 1, 2 and 3 kHz.
  • the useful frequency range is believed to lie between 50 Hz and 50 kHz.
  • the calculation of the fields and currents can also be performed using either dedicated circuitry or a dedicated or shared microprocessor.
  • ⁇ 90° B s,c -
  • the magnetic field for every possible location and orientation of the sensor in the mappable space can be obtained by using:
  • each field generator is used to solve a set of field equations, which are dependent upon the field form. Solving these equation sets produces the location and orientation of the remote sensors, most preferably simultaneously.
  • the field equations are derived specifically for each embodiment and are dependent on the geometry and characteristics of the radiators.
  • the field equations can be described as follows:
  • P 1 / n (X) is a generalized Legendre Polynomial of degree n, and calculated by:
  • V ⁇ The remote sensor orientation
  • B V B( P , O , I, K , V ) where K and V ⁇ are the unknown variables, and O ⁇ , P and I are the known variables for any given coil.
  • each radiator there are three radiators; therefore there will be three known values of P and three known values of O ⁇ .
  • the three sensors have a fixed and known location and orientation in the remote object reference frame. For each position and orientation of the remote object, one can compute the location and orientation of each sensor in the radiator reference frame and therefore compute the field sensed, B v , for each radiator and each sensor.
  • B v the field sensed
  • each field sensed by each sensor from every radiator is measured and the field equations are solved to obtain the location and orientation of the remote object (x, y, z, ⁇ , ⁇ ,and ⁇ ).
  • the nine sensor readings (B s,c ) are the measured quantity, and by solving this overdetermined system of equations (using a variety of known numerical methods such as the Newton-Raphson method for non-linear systems of equations or Multidimensional Secant Methods, specifically Broyden's method), the location and orientation of location sensor 14 is determined.
  • a description of several possible numerical methods for solving such a set of equations is found in William H. Press et al, "Numerical Recipes in C. The Art of Scientific Computing", second edition, Cambridge University Press, 1992. The location sensor position and orientation are displayed on monitor 27.
  • An ECG monitor may be used to synchronize the acquisition of the signals from the sensor coils so as to remove cardiac motion artifacts from the position information.
  • a reference sensor may be attached to a portion of an organ being tested or treated, such as the heart, which will be used to correct for breathing motion or patient movement. In this way, the acquired sensor positions may be referenced to the organ structure and not to an absolute outside reference frame, which is less significant.
  • Fig. 8 is a schematic of one analog based embodiment of signal processor 26.
  • three sine and three cosine wave signals of frequency f 1 , f 2 , and f 3 are used in addition to the SIG and CUR signals used in the embodiment of Fig. 6.
  • the SIG and CUR signals are filtered by 12 phase sensitive filters (correlators) 80, such as are shown in Fig. 9 to produce signals indicative of the sine and cosine components of the SIG and CUR signals.
  • Fig. 9 shows the expanded view of one possible embodiment of one of the analog filter elements of Fig. 8.
  • Each analog filter unit has three inputs; a cosine wave cos(2 ⁇ f c ) , a sine wave sin(2 ⁇ f c ) , and the signal, either one of SIG s or CUR s from which the frequency component f c is to be extracted.
  • the signal is multiplied by sin(2 ⁇ f c ) and cos(2 ⁇ f c ) in multipliers 84 and 86.
  • the results are passed through low pass filters 88 and 90 to obtain the desired components of the signal.
  • a remote object will have more than one set of sensors, preferably from 2 to 6 sets of sensors, that will provide sufficient parameters to determine the shape and/or configuration of a remote object, preferably relative to a reference frame.
  • the catheter has additional sets of sensors located proximal to its distal tip, it would be possible to determine the shape and/or configuration of portions of the catheter.
  • another invasive procedure such as a sigmoidoscopy or colonoscopy, it may be possible to determine the shape and/or configuration of some or all of the scope used.
  • the controller is a simple off-the-shelf 486 IBM compatible computer.
  • the A/D boards are commercially available and have the characteristic of being able to sample at least 8 channels with a sampling frequency of between 500 - 40,000 samples per second on each channel.
  • An example of such an A/D Board is the National Instruments AT-MIO-16X that is available from National Instruments, Texas, USA.
  • the D/A function is achieved using commercially available 8-21 bit resolution D/A boards. Examples of such a D/A are the National Instruments A/D,D/A Board AT-MIO-16X or National Instruments DSP model AT-DS2200.
  • the radiation driver amplifiers are commercially available, with 2-16 ohms output impedance and an output power of 60-500 watts.
  • An example of such amplifiers is the Inkel amplifier type NA-420, from Inkel of Seoul, Korea.
  • the radiators are also commercially available and have the following characteristics: 1-6 cm radius, 0.5-3 cm thickness, and 100-500 turns made of copper wire of diameter 0.1 -0.95 mm.
  • a specific example of such a coil could be coils having a 4 cm radius, 1 cm thickness with 151 turns of copper wire of 0.41 mm diameter.
  • sensors may be suitable for some applications, such as Hall effect sensors, for example those available from Allegro Micro Systems, Inc., USA or magneto-resistor sensors, sensors, flux gate magnetic sensors, and/or other magnetic flux sensors.
  • Hall effect sensors for example those available from Allegro Micro Systems, Inc., USA or magneto-resistor sensors, sensors, flux gate magnetic sensors, and/or other magnetic flux sensors.
  • Controller 40 represents an assemblage of units to perform intended functions. For example, such units may receive information or signals, process information, function as a controller, display information, and/or generate information or signals. Typically controller 40 may comprise one or more microprocessors.
  • active portion 16 of catheter 10 is a forward looking ultrasound send/receive transducer.
  • a transducer can give a one-dimensional map of the acoustic properties of the material lying in front of it by radiating a focused beam of pulsed acoustic energy and then measuring the echoes of the beam reflected by changes in acoustic properties along the path of the beam.
  • a focal beam of pulsed acoustic energy can be used to measure the echoes of the beam reflected by changes in acoustic properties along the path of the beam.
  • such a steerable, one dimensional acoustic transducer can be used to map the heart walls or blood vessels, ultrasonically, from inside the heart.
  • a transducer When coupled with a reference location sensor at a reference point on the heart and ECG gating of the acoustic pulses, such a transducer can generate the information required to form a three dimensional image of the heart or blood vessels or any other organ, at one or several different phases of the heart cycle.
  • Figs. 10A-10D The principle of two preferred embodiments of a steering mechanism are shown in Figs. 10A-10D and 11 respectively.
  • Fig. 10A shows a steering mechanism 92 that fits into the distal end of a catheter and comprises two steering wires 94 attached to a steering head 96.
  • Head 96 is formed of a relatively flexible material such as stainless steel and is slit along its axis, each side of the split being attached to one of wires 94.
  • Such a head may be manufactured by attaching two wires (94) at their end and then flattening the wires to form a more easily bent structure.
  • a relatively rigid housing containing locating sensor 14 and active portion 16 which, in the present preferred embodiment, is an ultrasonic send/receive transducer.
  • active portion 16 which, in the present preferred embodiment, is an ultrasonic send/receive transducer.
  • At least head 96 and wires 94 are encased in a catheter sheath 104 which is not shown in Figs. 10A-10C for clarity of presentation.
  • This steering mechanism can also be used for other active portion types such as for electropysiologic mapping procedures and for improved steering of catheters or many types, with or without location sensing.
  • Fig. 10B one of wires 94 has been shortened as compared with the other wire. Since the catheter sheath holds the wires together, the result of such shortening of one wire is bending of the head, which is facilitated by the axial slit. Locating sensor 14 and active portion 16 are rigidly attached so that measurement of position and orientation of the locating sensor will give the position and orientation of the active portion (ultrasound transducer). By varying the angle of bending and rotating the catheter, imaging over nearly 360° image can be achieved. Additionally or alternatively, as shown in Fig. 10C, the amount of rotation can be reduced by shortening the other wire and which causes bending in the other direction. Slight motion of the transducer can be corrected by a simple translation of the acquired one dimensional image associated with the particular position.
  • Fig. 10D shows a mechanism 98 placed at the proximal end of the catheter for changing the relative lengths of wires 94.
  • a handle 100 comprises a housing 102 to which catheter sheath 104 is attached.
  • the proximal end of wires 94 are formed in a loop (for example by welding the ends of the wire) and wrapped around a spindle 106 which is preferably fixed and which forms a frictional contact with the wires.
  • a lever 108 is rotatably attached near its center at a pin 110 to the housing and is attached at one end to wire 94 and at the other end to a slider 112 which is slidable parallel to the housing. When the slider is moved, one of the wires 94 at the distal end is lengthened with respect to the other.
  • Fig. 11 shows the distal end of a catheter having an alternative steering mechanism.
  • a relative rigid sleeve 114 is placed within cathode sheath 104.
  • Sleeve 114 can be axially displaced relative to the sheath from the proximal end of the catheter.
  • sleeve 104 The distal end of sleeve 104 is formed with a disk 116 through which a relatively less rigid wire 118 passes.
  • Wire 118 is formed with a permanent bend near its distal end at which end, position sensor 14 and active portion 16 are attached. Axial movement of sleeve 104 straightens wire 118 resulting in a change in orientation of both the position sensor and the active portion. If wire 118 is sited off axis, then rotating the wire will rotate the catheter.
  • steering of acoustic beams may also be achieved by a moving mirror or by a phased array ultrasonic transducer, and that such a mirror or other arrangement may be present in the active portion.
  • Such active scanning may supplement or replace the passive steering provided by the mechanisms of Figs. 10 and 11.
  • Fig. 12 shows a simplified system block diagram of ultrasonic acquisition and image formation in accordance with a preferred embodiment of the invention.
  • An image sensor 120 such as the ultrasound sensor described above, transmits an acoustic pulse 122 in response to a signal received from a transmitter driver circuit 124.
  • An acoustic echo 126 (generally comprising several echoes) is received by the image sensor which produces an echo signal, which when amplified, is sent to a receiver processing circuit 128 which generates a one dimensional "image" at its output 130.
  • Information identifying the heart phase of the image may also be present at output 130 which may comprise a plurality of output ports.
  • the acquisition of the image is made in response to signals received from an ECG monitor 132. This allows for acquisition of images at a particular portion of the heart cycle so that the various one-dimensional images can be easily reconstructed into a three dimensional image.
  • the most significant echo is used as the measure of the distance from the ultrasonic sensor to the chamber along the measurement direction of the sensor, then the collection of such distances (referenced to a reference point in the chamber) will allow the reconstruction of the surface morphology.
  • Fig. 13 shows a simplified block diagram of a three dimensional image reconstruction system which utilizes a series of one dimensional images generated by the circuitry of Fig. 12 and continuous sensed location and orientation information generated by the position locator and its associated circuitry as described above. In general it is useful to acquire the sensed location and orientation to coincide with the acquisition of each one-dimensional image.
  • One of the various methods described above for steering the distal tip of the catheter is used to acquire a plurality of one dimensional images with a plurality of orientations.
  • An automatic mechanism may be used to continuously change the orientation of the imaging head in accordance with the principles of Figs. 10 and 11 and to rotate the catheter so that operator intervention is not required.
  • An image reconstruction processor 132 orients and references the individual one dimensional images in accordance with the sensed location and orientation information and forms a 3-D image which can be presented on an image display 13 either in the form of a series of two dimensional slices or a full three dimensional reconstruction.
  • the image displayed may be a cine image of the reconstruction.
  • a two dimensional image is acquired by the ultrasound sensor which can be a phased array of acoustic crystals of a single crystal in conjunction with a mirror rotating about an axis that deflects the ultrasonic beam in a predetermined path.
  • active portion 16 comprises a sensor for sensing electrical signals generated at selectable positions on the heart. As described below, such sensings of electrical signals can be used to map the electrical activity of the heart.
  • the active portion may also include an electrode useful for pacing the heart and/or for ablating a portion of the heart. Such ablation is especially useful in the treatment of the most common lethal cardiac arrhythmia, ventricular tachycardia (VT), i.e., very rapid and ineffectual contractions of the heart muscle. VT is the cause of death of approximately 300,000 people annually. It is also useful in the treatment of other arrhythmias.
  • VT ventricular tachycardia
  • FIG. 14 A catheter useful for electrical mapping of the heart/ablation is shown schematically in Fig. 14.
  • Active portion 16 comprises a conducting tip, preferably of platinum, having a length of between 1-12 mm, preferably about 2 mm.
  • the tip is connected via a tip electrode lead-in wire 138 to a switch at the proximal end of the cathode which switches the tip to a source of voltage for pacing or/ablating or to a detector for detecting electrical signals generated by the heart.
  • a conducting ring electrode 136 is placed, proximal to locating sensor 14, on the outside of catheter sheath 104 and is connected to ground or to a recorder via a return lead 140.
  • a 1-10 ma pulse is applied between tip 16 and ring electrode 136.
  • When used for ablation RF energy at about 0.5 MHz and 10-100 V is applied for 10-200 sec.
  • Locating sensor 14 is rigidly attached to the tip and the sensor and tip may be manipulated by an eccentric wire 142.
  • the twisted wire leads are preferably shielded by a shield 144 to reduce pickup from the relatively high voltages carried by leads 138 and 140.
  • an electrically insulating heat shield 146 is placed between the tip and the locating sensor.
  • Fig. 15 is a schematic block diagram for acquiring a basic electrocardiogram map in accordance with a preferred embodiment of the invention.
  • a transesophageal echocardiograph in the preferred embodiment, a multiplane image of the heart chambers is acquired prior to the mapping study. The image is acquired only during a fiducial point in time during the cardiac cycle. In the preferred embodiment, the image is acquired at end-diastole in response to an end diastole synch-signal. A three-dimensional image of the heart chambers is reconstructed indicating the endocardial morphology and the location of one or more reference catheters within the heart chamber.
  • This image can be acquired by a 3-D transesophogal ultrasound image, by a CT scanner, by an MRI scanner or by other imaging techniques.
  • the image can also be constructed by touching the catheter to the surface of the chamber (endocardium) in a number of places and measuring the positions. These points can then be used to describe a thee dimensionsional surface which represents the chamber surface.
  • reference locatable catheters were placed at three positions in the heart to form a reference plane against which the position of the active catheter was referenced.
  • these reference locatable catheters were placed, for example, in the right ventricular apex, the right atrial appendage, and the pulmonary artery at the level of the pulmonary valve, respectively.
  • a reference catheter having a location sensor 14 as described hereinabove is used for reference purposes, only a single sensor is required to define the relative location and orientation of the mapping catheter. While any of these locations can be used, it is presently preferred to place the reference sensor in the distal coronary sinus.
  • Fig. 16 is a schematic block diagram for illustrating the computerized endocardial activation mapping algorithm (used during sinus rhythm mapping and during ventricular tachycardia mapping).
  • a visible or audible indicator preferably indicates the beginning of a data point acquisition. Both electrical activity and location/orientation data are acquired for each point in the map.
  • the acquisition of catheter location information is shown in left branch of the block diagram of Fig. 16.
  • the mapper electrode is in steady and stable contact with the endocardium. Stable contact is determined by measuring the stability of the location reading, the stability of the sensed electrograms and the impedance of the contact.
  • the position and orientation of the locating sensor in the mapping catheter are determined continuously in accordance with the method described above and are saved in response to an end diastole synch signal.
  • the mapper catheter tip is localized relative to the reference catheter by finding the difference in each of the six dimensions of the location and orientation.
  • the orientation of the mapper cathode is not required, however, it must be acquired to properly transform its location and orientation to an internal heart coordinate system.
  • the activation time of the heart at the mapper cathode tip is determined as shown on the right side of Fig. 16.
  • the local activation time is then defined with reference to the activation time measured by an ECG terminal on the skin of the patient.
  • the process of data acquisition can be terminated by the user, or can be evaluated by an "evaluate activation map” algorithm described below, that examines the already acquired activation map for the density of information relative to the spatial gradient of activation times.
  • This algorithm can indicate the next preferable site for activation time detection. The catheter is moved by the user to the new site, and the process of mapping continues.
  • VT a data point is determined about every 4 to 6 heart beats. Thus, approximately 15 to 25, typically about 20, data points can be determined each minute.
  • Fig. 17 is a schematic block diagram for illustrating the computerized pace mapping algorithm.
  • a visible or audible indicator indicates the beginning of a data point acquisition. Acquisition of position information is similar to that for Fig. 16 except that the average mapper location in the previous n heartbeats (n is the moving average window duration) is calculated.
  • Fig. 17 shows the determination of the ACI (AutoCorelation Index) in a pace mapping mode.
  • an ECG processor acquires ECG data while the patient's heart is paced by an external source at a rate similar to the patient's arrhythmia cycle length.
  • the ECG data is also acquired from the body surface electrograms, and the signals are stored as a segment of ECG with a length of several cycles.
  • the signal acquired is subjected to automatic comparison with the patient's own VT signal (see Fig. 18).
  • the comparison between arrhythmia morphology and paced morphology is performed in two stages: First, the phase shift between the template VT signal and the paced ECG morphology is estimated using minimal error or maximal cross-correlation for two signals. Then, using this phase shift estimated from an index ECG channel, the similarity of the VT and the Raced ECG morphology is measured as the average of the cross-correlation or the square error of the two signals of all channels recorded.
  • This two-stage calculation is repeated each time using a different ECG channel as the index channel for determining the phase shift.
  • Fig. 18 is a schematic block diagram illustrating an algorithm used to calculate the cross-correlation index while pace-mapping in accordance with a preferred embodiment of the invention.
  • Body surface ECG data is acquired at two stages. First, during spontaneous or pacing induced VT, and second, during pacing the endocardium at different sites.
  • the ECG data acquired during VT are signal averaged, and a template is constructed (T ch , for each channel recorded).
  • T ch for each channel recorded.
  • N the same number of beats
  • the algorithm calculates the phase shift between P ch and Tch, which yields for the first channel the maximal cross-correlation.
  • This time shift is used to shift the remaining channels and calculate for them the cross-correlation. All cross-correlations for all channels are summarized and stored. The algorithm then uses the next channel recorded to calculate the time shift that will cause maximal cross-correlation in this channel. Now this time shift is applied for all cross-correlations between P ch and T ch , and again all cross-correlations are summarized. This procedure is repeated for all channels, and the maximal cross-correlation achieved is used as the value of the cross-correlation of the T ch and the P ch at this site on the endocardium.
  • FIG. 19 is a schematic block diagram for illustrating the output configuration of the present embodiment.
  • a quasi-static picture of the heart chambers is presented as 3-D reconstruction of a basic image acquired prior to or during the study as previously described. Superimposed on the image is the location of the mapping/ablation catheter (corrected for the movement of the reference catheter) and the current and previous information acquired from the mapping study. This information may include, when appropriate, the activation times (presented using a color code at each acquisition site) or cross-correlation index (ACI) for each point in the pace map.
  • the map can represent in the color coding the duration of the local electrograms, the presence of fragmented activity as well as various other variables calculated by the electrophysiologic processor.
  • the catheter may be replaced by a needle whose tip is the locatable sensor port.
  • electrographic maps of the heart are also possible. By use of variables determined from paced or non-paced acquisitions of electrographic data, the following additional maps can be generated:
  • the sites where VT was terminated by a non-captured premature stimulus can be presented.

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Claims (33)

  1. Ortungssystem zum Bestimmen des Ortes und der Ausrichtung eines invasiven medizinischen Instrumentes (10) relativ zu einem Referenzrahmen, mit:
    einer Vielzahl von Feldgeneratoren (18, 20, 22), die bekannte unterscheidbare Felder in Antwort auf Treibersignale erzeugen;
    einer Vielzahl von Sensoren (14), die sich in dem invasiven medizinischen Instrument (10) nahe dessen distalem Ende (15) befinden, die Sensorsignale in Antwort auf die Felder erzeugen; und
    einem Signalprozessor (26), der einen Eingang für eine Vielzahl von Signalen entsprechend den Treibersignalen und den Sensorsignalen hat, dadurch gekennzeichnet, daß der Signalprozessor (22) so angeordnet ist, daß er drei Ortskoordinaten und drei Ausrichtungskoordinaten eines Abschnittes (16) des invasiven medizinischen Instrumentes (10) in Antwort auf die Treiber- und Sensorsignale berechnet.
  2. Ortungssystem nach Anspruch 1, bei dem einer aus der Vielzahl der Feldgeneratoren (18, 20, 22) oder Sensoren (14) drei unterscheidbare, nicht überlappende Generatoren oder Sensoren aufweist.
  3. Ortungssystem nach Anspruch 1, bei dein die Vielzahl der Feldgeneratoren (18, 20, 22) drei unterscheidbare, nicht überlappende Generatoren aufweist und die Vielzahl der Sensoren drei unterscheidbare nicht überlappende Sensoren aufweist.
  4. Ortungssystem nach einem der Ansprüche 1 bis 3, bei dem jeder Sensor (14) eine Spule (30, 32, 34) aufweist.
  5. Ortungssystem nach Anspruch 4, bei dem die Vielzahl der Spulen (30, 32, 34) Achsen hat, die sich innerhalb einer der Spulen (30, 32, 34) schneiden.
  6. Ortungssystem nach Anspruch 4 oder Anspruch 5, bei dem die Vielzahl der Spulen (30, 32, 34) drei Spulen aufweist und bei dem die Spulen (30, 32, 34) Achsen haben, die sich nicht alle in einem Punkt schneiden.
  7. Ortungssystem nach einem der vorangehenden Ansprüche, bei dem die Felder, die von jedem der Feldgeneratoren (18, 20, 22) erzeugt werden, eine unterschiedliche Frequenz, eine unterschiedliche Phase oder sowohl eine unterschiedliche Frequenz als auch eine unterschiedliche Phase haben.
  8. Ortungssystem nach einem der vorangehenden Ansprüche, bei dem das Feld, das von jedem Feldgenerator (18, 20, 22) erzeugt wird, eine unterschiedliche Frequenz hat.
  9. Ortungssystem nach Anspruch 8, bei dem die Frequenzen des Feldgenerators (18, 20, 22) jede ganzzahlige Vielfache einer gegebenen Frequenz sind.
  10. Ortungssystem nach einem der Ansprüche 7 bis 9, bei dem der Signalprozessor (26) die Signale, die den Treiber- und Sensorsignalen entsprechen, kreuzkorreliert.
  11. Ortungssystem nach Anspruch 9, bei dem der Signalprozessor (26) die Signale, die den Treiber- und Sensorsignalen entsprechen, kreuzkorreliert, und bei dem die Dauer der Kreuzkorrelation der Eingaben das kleinste gemeinsame Vielfache der ganzzahligen Multiplikatoren ist, dividiert durch die gegebene Frequenz.
  12. Ortungssystem nach Anspruch 10 oder Anspruch 11, bei dem die Ergebnisse der Kreuzkorrelation benutzt werden, um den Beitrag jedes Feldgenerators (18, 20, 22) zum Signal, das von jedem Sensor erzeugt wird, berechnet.
  13. Ortungssystem nach einem der vorangehenden Ansprüche, bei dem die Felder Wechselstrom-Magnetfelder sind.
  14. Ortungssystem nach Anspruch 13, bei dem die Wechselstrom-Magnetfelder kontinuierliche Felder sind.
  15. Ortungssystem nach einem der vorangehenden Ansprüche und mit einem Anzeigesystem (27) zum Anzeigen der Position des Abschnittes (16) auf dem invasiven medizinische Instrument (10).
  16. Ortungssystem nach einem der vorangehenden Ansprüche, bei dem es einen zusätzlichen Sensor auf dem Abschnitt (16) des invasiven medizinischen Instrumentes (10) gibt, der eine lokale Bedingung abfühlt.
  17. Ortungssystem nach Anspruch 16, bei dem der zusätzliche Sensor lokale elektrische Signale abfühlt und sie an Anschlüsse außerhalb des Körpers des Patienten überträgt.
  18. Ortungssystem nach Anspruch 17, bei dem die lokalen elektrischen Signale elektrische Signale vom Endocardium des Herzen des Patienten sind.
  19. Ortungssystem nach Anspruch 18, bei dem der Signalprozessor (26) die Position und Ausrichtungskoordinatensignale und die lokalen elektrischen Signale, die an einer Vielzahl von Punkten auf dem Endocardium erfaßt worden sind, verarbeitet, um eine Abbildung zu erzeugen, die die Fortpflanzung elektrischer Signale durch das Gewebe in dem Körper des Patienten darstellt.
  20. Ortungssystem nach einem der Ansprüche 16 bis 19 bei dem der zusätzliche Sensor so arbeitet, daß elektrische Energie an das Endocardium zum Abtragen eines Teils des Endocardiums geliefert wird.
  21. Ortungssystem nach einem der Ansprüche 1 bis 16 und mit einer Elektrode, die zum Zuführen elektrischer Energie an das Endocardium zum Abtragen eines Teiles des Endocardiums ausgelegt ist.
  22. Ortungssystem nach Anspruch 16, bei dem der zusätzliche Sensor ein Ultraschall-Sender/Empfänger ist.
  23. Ortungssystem nach Anspruch 22, bei dem der Ultraschall-Sender/Empfänger eine weniger als dreidimensionale Darstellung der akustischen Eigenschaften des Gewebes jenseits des distalen Endes (15) liefert.
  24. Ortungssystem nach Anspruch 23, bei dem das distale Ende (15) ablenkbar ist.
  25. Ortungssystem nach Anspruch 24 und mit einer Bildrekonstruktionsschaltung, die eine Vielzahl der weniger als dreidimensionalen Darstellungen empfängt, die bei unterschiedlichen Ausrichtungen des distalen Endes (15) erhalten worden sind, und eine dreidimensionale Abbildung der akustischen Eigenschaften von Gewebe, das wenigstens teilweise das distale Ende (15) umgibt, erzeugt.
  26. Ortungssystem nach Anspruch 15 und weiter mit einem Referenzinstrument, das eine Vielzahl zusätzlicher Sensoren umfaßt, die sich in dem Referenzinstrument befinden, wobei das Anzeigesystem (27) die Position des Abschnittes (16) auf dem invasiven medizinischen Instrument (10) relativ zu der Position eines Punktes auf dem Referenzinstrument anzeigt.
  27. Ortungssystem nach Anspruch 26, bei dem das Ortungssystem nur ein einzelnes Referenzinstrument aufweist.
  28. Ortungssystem nach Anspruch 26 oder 27, bei dem das Referenzinstrument ein zusätzliches invasives medizinisches Instrument ist und bei dem die zusätzlichen Sensoren sich nahe dem distalen Ende des Instrumentes befinden.
  29. System nach einem der vorangehenden Ansprüche, bei dem das invasive medizinische Instrument ein Katheter oder Endoskop ist.
  30. Verfahren zum Bestimmen der Position und Ausrichtung eines invasiven medizinischen Instrumentes (10) mit einem distalen Ende (15), das umfaßt:
    (a) Erzeugen einer Vielzahl unterscheidbarer geometrisch unterschiedlicher Wechselstrom-Magnetfelder;
    (b) Abfühlen der Wechselstrom-Magnetfelder an einer Vielzahl von Sensoren (14) nahe dem distalen Ende; und
    (c) Berechnen von sechs Dimensionen von Position und Ausrichtung eines Abschnittes (16) des invasiven medizinischen Instrumentes (10) in Antwort auf Signale, die repräsentativ für die erzeugten Magnetfelder und die abgefühlten Magnetfelder sind.
  31. Verfahren nach Anspruch 30, bei dem die Vielzahl unterscheidbarer geometrisch unterschiedlicher Felder drei solcher Felder aufweist.
  32. Verfahren nach Anspruch 30 oder 31, bei dem das Wechselstrom-Magnetfeld an drei Punkten des invasiven medizinischen Instrumentes (10) abgefühlt wird.
  33. Verfahren nach einem der Ansprüche 20 bis 32, bei dem das invasive medizinische Instrument (10) ein Katheter oder Endoskop ist.
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EP0894473A2 (de) 1999-02-03
EP0776176A1 (de) 1997-06-04
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JP2004275776A (ja) 2004-10-07
ATE188108T1 (de) 2000-01-15
HK1007059A1 (en) 1999-04-01
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CA2607769C (en) 2012-04-24
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AU1693095A (en) 1996-03-14
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CA2197986C (en) 2008-03-18
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CA2197986A1 (en) 1996-02-29
EP0894473A3 (de) 1999-07-07
CN1226960C (zh) 2005-11-16
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DE69532139D1 (de) 2003-12-18
CN1168625A (zh) 1997-12-24
EP0894473B1 (de) 2003-11-12
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